1 files changed, 4 insertions, 0 deletions
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index d2f1016891b..7bd04626bbd 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -2976,6 +2976,10 @@ Item_func_group_concat::fix_fields(THD *thd, Item **ref)
       maybe_null|= args[i]->maybe_null;
   }
 
+  if (agg_item_charsets(collation, func_name(),
+                        args, arg_count, MY_COLL_ALLOW_CONV))
+    return 1;
+
   result_field= 0;
   null_value= 1;
   thd->allow_sum_func= 1;